What do researchers do when conducting descriptive or correlational research

A)  They simultaneously manipulate two or more independent variables. 
B)  They systematically describe patterns of behaviour and discover relationships among variables. 
C)  They manipulate a variable under carefully controlled conditions and observe whether there are changes in a second variable as a result. 
D)  They expose subjects to two closely related treatment conditions.

When conducting descriptive or correlational research, researchers systematically describe patterns of behavior and discover relationships among variables, rather than manipulating variables or conditions. This is why Option B is the correct answer. Option A refers to experiments with multiple independent variables, while option C describes experimental research with manipulated variables. Option D describes a study design that is not necessarily descriptive or correlational in nature.